CN1231454C - Method for the continuous production of methyl formiate - Google Patents
Method for the continuous production of methyl formiate Download PDFInfo
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- CN1231454C CN1231454C CNB008108420A CN00810842A CN1231454C CN 1231454 C CN1231454 C CN 1231454C CN B008108420 A CNB008108420 A CN B008108420A CN 00810842 A CN00810842 A CN 00810842A CN 1231454 C CN1231454 C CN 1231454C
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/36—Preparation of carboxylic acid esters by reaction with carbon monoxide or formates
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Abstract
The invention relates to a method of producing methyl formiate by reacting excess methanol with carbon monoxide under increased pressure and increased temperature in the presence of an alkalimethylate or alkaline earth methylate as the catalyst in a pressure-proof reactor. The inventive method uses at least two reactor elements, preferably countercurrent reactors, at a temperature of approximately 100 DEG C and a pressure of approximately 100 bar in combination with a solid-matter free desalination of the reactor product. The inventive method provides a means for producing methyl formiate of any quality desired and with an excellent production capacity in a very economical and complication-free manner. The invention further relates to a method of solid-matter free desalination and to devices for carrying out the inventive method.
Description
The present invention relates to a kind of method of methyl-formiate, methyl-formiate that is used to implement the device of this technology and makes and be particularly useful for to prepare formic acid by this method of preparing.
Methyl-formiate is at the industrial preparation formic acid that is mainly used in, for this reason, it at present by methyl alcohol and carbon monoxide in the presence of alkali metal alcoholates reaction and scale operation.But the industrial implementation of this method existing problems, therefore make this technology inconvenience, unreliable and power consumption obviously increases its cost.
Carry out industrial scale applications in order to seek perfect craft, basically on both direction, develop the technology that is used to implement this technology: the CO pressure that a kind of process using is very high, purpose is to obtain the very methyl-formiate of high density in the ejecta of reactor, another kind of method is then used lower CO pressure, purpose is to obtain the methyl-formiate of low concentration to avoid in reactor, to form salt deposit on the cooling surface and in valve in reaction mixture, can carry out trouble-free operation in a long time like this.
DE-C-926785 discloses a kind of high-pressure process, and wherein reaction mixture circulation and alternating current are crossed reactor and water cooler.New methyl alcohol and be fed to reactor head as catalyst dissolution sodium methylate wherein, and carbon monoxide or the gaseous mixture that the comprises carbon monoxide bottom at service temperature 80-130 ℃ reactor under 300 bar pressures is injected.The cyclic reaction mixture of part is discharged continuously by a pressure chamber.This technology uses the lower concentration catalyzer that is no more than 0.25% weight sodium (corresponding to 0.59% weight sodium methylate) to carry out keeping the least possible salt deposit, and reactor is by stirring to keep the suspension of deposited salt.
At first this already known processes needs high device expenditure, and especially, high pressure stirs and causes indeterminable basically engineering problem.Although the engineering expenditure is high, also can not prevent from this technology, to form relevant problem with solid deposits.Therefore this technology can not be carried out the trouble free operate continuously in acceptable time.For this reason, actual obtainable throughput is unsatisfactory and this technology is uneconomical on the whole.
DE-C-1046602 discloses a kind of continuous two step process that are used to prepare methyl-formiate, in the first step, methyl alcohol is in chuck refrigerative pipe reactor, under the pressure of 60-140 ℃ and 50-300 crust, in turbulent flow, in the presence of 0.5-5% weight basic metal alkoxide with the transformation efficiency of 70-75% with react at the CO that a plurality of different sites are fed to this pipe reactor with shunting mode.The reaction mixture that obtains in the first step reacts with excessive CO in autoclave subsequently, generates methyl-formiate up to the transformation efficiency that obtains based on used methyl alcohol about 90%.In this technology, be difficult to guarantee the required condition in the reactor, i.e. the maintenance of the specific temperature of reaction under the turbulent flow simultaneously.In addition, the industrial implementation of this technology needs very difficulty, very accurately controlled chilling water temperature, CO pressure and logistics speed.In second step of this technology, cooling only realizes from the reaction mixture of the first step by adding pre-cooled carbon monoxide and/or overcooling.If prevent the fault that causes because of crust, two kinds of schemes all need high device expenditure.In addition, need use pure especially, if desired, the CO of prepurification is to avoid the fouling of sedimentary formation and cooling surface.Although pure throughput from the work embodiment that mathematics is derived is 1674 kilograms/meter
3/ hour, but this method is still because engineering expenditure is high, the huge and danger that itself still might stop up of difficulty and can not be used for continuous production methyl-formiate when setting and monitoring process condition.
The applicant of this patent has carried out deep trial to overcome the problem in this method.These attempt having caused being described in the technology of DE-C-1147214.At this, at least two strands of carbon monoxide streams add tower shape reactor with different height, form different reaction zones like this in reactor.In first district, the about 75-85% that comprises the reinforced methyl alcohol of 0.12-0.3% mole alkali methylates changes into methyl-formiate under 30-100 ℃ under the CO pressure of 150-200 crust, and in next district of reactor, be reflected at and proceed to about 95% transformation efficiency under 40-60 ℃.Naturally the salt shape throw out that forms in this technology should be by keeping the constant flow of the various CO streams of flip-flop simultaneously in total flux under the regular or irregular timed interval, by guaranteeing enough flow of reaction mixture flow rates and the mobile valve wherein taking place and can prevent from unit, to deposit by opening and closing suddenly repeatedly.But according to work embodiment, the throughput of this technology in the single experiment of time limit is arranged is only for about 440 kilograms/meter
3/ hour.
This process variations needs high expenditure with monitoring and the flip-flop CO stream and the valve control that are complementary with operating value equally.Even now can not be avoided catalyzer and degradation production thereof the deposition on unit in the longer operating time, cause the further decline of stoppage time and output.
In being described in another high-pressure process of DE-A-19506555, methyl alcohol 50-150 ℃ down with CO under the pressure that 210-250 clings to, in the presence of the 0.05-0.2% of low concentration weight alkali methylates catalyzer, in reactor or reactor cascade, react.Rapid reaction can realize by the special carbon monoxide that disperses well to be added into reaction mixture, and this can be blown into it by nozzle and realizes.CO stream can be used as the reinforced and possible used cascade reactor of son stream can have a temperature distribution.Comprise the methyl-formiate of about 97% weight by the reaction mixture of reactor discharging, and according to embodiment, throughput is 530-960 kilogram/rice
3/ hour.
Unreacted methanol re-uses after the reaction mixture distillation.But the recirculation of catalyzer is not provided, after handling crude product, forms relatively large solid waste like this, although catalyst concn is low.In addition, obtaining possible in principle high conversion cause crusting deposition in equipment, must be cost with the Equipment Downtime at this equally, and this greatly reduces in single experiment good throughput itself.In addition, since the operation pressure height, the fund cost height of equipment, so this technology is not exclusively satisfactory economically.
Above-mentioned high-pressure process might obtain high methyl alcohol and CO transformation efficiency, but causes above-mentioned engineering problem and economic disadvantages, the salt sedimentation on especially high fund cost and the unit.
So-called low pressure process provides a kind of technological process of alternative high-pressure process, and it is operated under the low CO pressure of about 10-100 crust.These reaction conditionss cause lower methanol conversion, but have generally avoided the precipitation of salt.Low pressure process is also embodied in the various embodiments.
German patent specification Nr.863046 discloses a kind of continuous method for preparing methyl-formiate, and German patent specification Nr.880588 has described its an improvement embodiment.In this technology, the sodium alkoxide solution that comprises 1-2.5% weight sodium (corresponding to 2.3-5.9% weight sodium methylate, if use methyl alcohol) is reacting with carbon monoxide under the pressure of 10-30 crust under 85-90 ℃.In the technology of German patent specification Nr.863046, adverse current of the alkanol solution of sodium alkoxide and carbon monoxide is through reactor, and in the improvement technology of DE-C-880588, reactant and stream are through reactor cycles.Reaction conditions, temperature, liquid phase flow rate and pressure are set and are made, maintenance is at least still unconverted as the alkanol of the basic metal alkoxide dissolving aequum of catalyzer.Improve in the technology at this, methyl-formiate that forms through reactor time the and excessive methanol flow by the reactor discharging with CO according to its equilibrium vapor pressure.The size that should set CO stream makes that methyl-formiate is removed as far as possible fully from system.Leave compound methyl alcohol and methyl-formiate and from the circulation loop expel liquid mixture of CO stream by cooling off condensation to carry secretly as much as possible of reactor.Cold carbon monoxide is preheated to temperature of reaction subsequently once more and is recycled to reactor.
The methyl alcohol that so obtains/methyl-formiate mixture comprises the methyl alcohol of 38-40% weight.It is carried out fractionation and methyl alcohol is back to circulation route equally.In the improvement embodiment of the technology that for example is described in DE-C-880588,, per hour only obtain the output of 3.1 kilograms of methyl-formiates by the reactor of 770 liters of volumes according to the data among the work embodiment.This is corresponding to only 4.0 kilograms/meter
3/ hour throughput.Throughput is low to moderate so technology can not carry out industrial-scale production fully.In addition, extra high catalyst concn brings significant defective: in reaction process, catalyst activity is general to be reduced gradually owing to form alkali metal formate inevitably.For this reason, the recycle methanol that contains catalyzer that always must discharge section and must add the raw catalyst solution of respective amount.In this process, be used to cool off with reheat should the circulation carbon monoxide and to be used to distill the required energy consumption of dilute formic acid methyl esters also be significant.
German patent specification 2243811 discloses a kind of continuous method for preparing methyl-formiate, wherein methyl alcohol is under 50-130 ℃, in the presence of 0.4-1.5% weight alkali methylates, have overflow, react with the back flow of gas that comprises carbon monoxide in the tower of preferred single refrigerative column plate.
The CO dividing potential drop should should be 50-1500 second for 40-150 crust and the residence time of reactant in tower.At the methyl-formiate that comprises 20-70% weight through the reaction mixture that obtains in the bottom after the tower.It is handled by distillation.
Except the high fund cost of complicated tower structure, main drawback is that only a part of added methyl alcohol and carbon monoxide composition consume and a high proportion of catalyzer utilizes bad in this technology.This cause because be used for preheating CO and being used to distill the energy consumption of all reaction mixtures that take out at the bottom of the tower and further increase additional expensive.At last, the problem of the distillation residue that contain catalyzer and salt is handled in technical existence.
US-A-4661624 has described a kind of method for preparing methyl-formiate, wherein methyl alcohol and CO are under 70-130 ℃, under the 5-70 bar pressure, under the existence of the sodium alkoxide catalyzer of 1-8% mole (based on used alcohol, corresponding to the sodium methylate of 1.7-13.5% weight), react.Control this technology and make that transformation efficiency is limited as the 2-10% of used alcohol, although avoided the salt sedimentation in the reactor thus fully, the content of methyl-formiate in reaction product only is 1-19% weight.The reaction mixture of discharging is handled by distillation, needs irreplaceable high-energy because methyl-formiate content is low, even adopt the reaction heat of integrating in the hot system.The methyl alcohol that obtains after the distillation returns this technology with dissolving catalyzer wherein.But, must in this technology, add relatively large raw catalyst continuously owing to need the active catalyst of high density.In addition, comprise add carbon monoxide gas utilize unsatisfactory.
DE-A-4309731 relates to a kind of method for preparing methyl-formiate, wherein with methyl alcohol in the mixing zone with carbon monoxide or the gas that comprises carbon monoxide under 60-100 ℃, cling at 10-300 (in work embodiment, 57 crust) under the pressure, in the presence of 0.4-1.5% weight alkali methylates, carry out partial reaction.The mixture that wherein obtains is saturated and through an afterreaction district with CO, need not to add starting raw material again and finishes in this reaction.In this technology, in reaction product, only obtain the methyl-formiate of lower concentration equally, so the energy balance of this technology is not favourable.
DE-C-2710726 discloses a kind of method for preparing methyl-formiate, wherein with 0.2-2.5% weight alkali methylates or alkaline-earth metal methylate the solution circulated in methyl alcohol through a reactor, wherein liquid phase is present in the bottom, and its top then comprises a kind of gas phase of the 20-100% of containing volume carbon monoxide.Be reflected under the pressure of 70-110 ℃ and 20-110 crust and carry out.This catalyzer methanol solution use a kind of in gas phase the liquid jet (as, crash panel) of atomizing high-velocity jet, or the device (as, Venturi) that is absorbed gas and it is injected liquid phase as rill by gas phase is fed in the reactor.
In liquid circulation loop, there are the heat exchanger that accurately to set the circulating liquid temperature and one can keep the powerful pump of liquid circulation turbulent.In operation, new methylate methanol solution continuous charging is in reactor, and the reaction mixture of respective amount is discharged and necessary distillation is handled.
According to the document,, advantageously set the reinforced and discharging of starting raw material and make reaction mixture comprise the methyl-formiate of about 44-65% weight owing to the heat power reason.If with the sedimentary cost that forms, can obtain the reaction product of 82% methyl-formiate content.Although these throw outs are tolerable according to this document, this is only based on the once independent experiment of carrying out in finite time.Under any circumstance, these throw outs cause the wearing and tearing of used high throughput recycle pump and any crash unit or Venturi to increase.Cause the high-energy cost by separating this material in the mixture that comprises 44-65% weight methyl-formiate only.High catalyst consumption and the suitable expense of handling distillation residue that the high running cost of this technology is also caused from high catalyst concentration (in 5 in 6 embodiment, 2.5% weight).Another shortcoming of this technology is that the increase of methyl-formiate content in reaction product causes the decline of throughput.
Carried out various trials so far, adopted to overcome shortcoming and the problem relevant with above-mentioned currently known methods with the different scheme of being described so far.
Promptly, describe, by add Synergist S-421 95, especially cyclic polyether (EP-B-0048891), surfactivity solubilizing agent such as alkali perfluoro alkyl sulfonate (EP-B-0596483) or inertia, polarity, aprotonic solvent (EP-A-0251112) prevents that throw out from forming and/or improving throughput.Other trial comprises, adds the mixture of other catalyzer such as amidine derivative (EP-A-0104875) or amine and ethylene oxide.The shortcoming of these technologies is that all they have introduced additional organic substance in reaction mixture, and these materials must dispose after handling, and this has eliminated any benefit that the productive rate raising is obtained.In addition, the purchase price of described additive is a unsurmountable obstacle to its industrial application.
We find shockingly that if adopt following method, methyl-formiate can also be made with good yield very cheaply according to a kind of trouble-free mode, need not complicated additive.
The invention provides a kind of method for preparing methyl-formiate, comprise excessive methanol and carbon monoxide under super-atmospheric pressure and high temperature, in the presence of as the alkali methylates of catalyzer or alkaline-earth metal methylate, in voltage-resistant reactor, react, from reaction product, separate formed methyl-formiate and will not have the liquid phase of methyl-formiate to be recycled to reactor basically, the liquid phase of the recirculation of wanting of while discharge section also adds raw catalyst solution, wherein said being reflected in the cascade that comprises at least two reactor units under 80-120 ℃, under the carbon monoxide pressure of 90-180 crust, in the presence of based on the alkali metal alcoholates of liquid charge weight 0.05-0.5% weight or alkaline-earth alkoxides, carry out, wherein set the ratio of the amount of reinforced starting raw material of unit time, temperature of reaction, pressure and reactant in reactor unit the residence time so that keep catalyst system therefor and degradation production under reaction conditions in reactor and the methyl alcohol that in the new reactor ejecta, dissolves aequum basically fully unreacted still, total ejecta of reactor is delivered to a stripper plant to strip methyl-formiate basically from reaction mixture, the part (TR) of residue liquid phase is recycled to reactor and a part (TA) is discharged, depend on that wherein alkali metal formate or alkaline-earth metal formate content are controlled TR in the degassing reaction product: the TA splitting ratio makes the solid of an alkali metal salt or alkaline earth salt separate out at any position of this technology no longer to occur, in a desalting plant, from the part of discharging, remove remainder catalyst and catalyst decomposes product then, and will remain methyl alcohol and directly or indirectly be back to reactor in the mode of no solid matter.
The inventive method should be used 2-5, and the reactor unit of preferred 2-4 cascade carries out.Basically the reaction mixture of forming by methyl alcohol, methyl-formiate and dissolved activity and spent catalyst can be relative basically by CO or contain gas phase cocurrent flow that the gaseous mixture of CO forms or adverse current through this reactor cascade.Preferably carry out counter-current operation.
The inventive method is preferably carried out under 90-110 ℃.The preferred pressure scope is the 110-160 crust, especially the 110-140 crust.Obviously, this method also can be carried out under elevated pressures, but this causes advantage of the inventive method forfeiture.
The catalyzer that is used for the inventive method is alkali metal alcoholates or alkaline-earth alkoxides, particular methanol salt.Preferably alkali methylates, especially sodium methylate and potassium methylate, they also can mix use mutually.Under specific process conditions, for example, if occur being higher than ordinary methyl-formiate concentration in single processing step, the use of potassium methylate can bring benefit.Pure consideration economically also can influence as the cost of catalyst substance and/or availability and to approve of that use one of may catalyzer or approve of the decision of using its combination.
Be used for catalyst for reaction because inevitable side reaction meeting changes into catalysis inactivation material.That is, trace water can cause forming alkali metal hydroxide or alkaline earth metal hydroxides, trace CO
2Cause the formation of carbonate, the reaction of alkoxide and gained methyl-formiate causes alkali metal formate or alkaline-earth metal formate, and the direct reaction of alkali metal hydroxide and alkaline earth metal hydroxides and carbon monoxide also forms alkali metal formate or alkaline-earth metal formate as by product.
All that are formed by catalyzer by secondary order reaction are referred to as " spent catalyst " or " catalyst decomposes product " below the catalysis inactivation product.
Preferred catalyst concn is the 0.1-0.3% weight based on the liquid charge weight, for example 0.2% weight.
Find shockingly that the catalyst consumption that produces because of side reaction can significantly reduce by the cascade of reactor unit.This is attributable to: the cascade of reactor unit has greatly suppressed to be present in the back-mixing of the reaction mixture in the single reactor unit, its further advantage (this does not obviously give any concern as yet in common process) also is, in technology of the present invention, be different from many common process, low methyl-formiate concentration in the catalyzer charging zone, occurs.
Such benefit is, although catalyst concn is low, but obtain of great value economically high conversion, and only need from technology, to remove more a spot of spent catalyst.
Under above-mentioned reaction conditions, about 30% catalyzer consumes in reactant one way process reactor and the unitary process of downstream processing.When this percentage ratio of assessment, must be noted that the absolute value of catalyst consumption is conclusive to the economic interests of this technology.Because the present invention's required catalyst concn in synthetic is low, this absolute value is starkly lower than already known processes.Certainly, its amount must be fed in this reactor corresponding to the not consumption of discharging in the desalination step and the raw catalyst methanol solution of spent catalyst amount.
The reinforced form of this make-up catalyst is 10-50% weight concentration (concentrated as far as possible in this scope), preferred 20-40% weight concentration, for example methanol solution of 30% weight concentration.
Suitable conditioned reaction thing feeding in raw material in synthesis reactor makes that the mol ratio of methyl alcohol and carbon monoxide is 3: 1-0.5: 1, preferred 2: 1-1: 1.
In addition, if gas adds at the first reactor unit place or at two first reactor unit places of reactor chain, the amount that is fed to the gas of single cell simultaneously can change as required to establish specific required reaction conditions, and the handiness of this method increases.
The numbering of reactor unit starts from the carbon monoxide adding, and (figure Nr.5) takes out (figure, that end of reactor chain Nr.6) with reaction product.
Have been found that, if enforcement the inventive method, particularly advantageous is to set reaction conditions in the reactor unit so that 75-95%, and the reaction heat of preferred 80-95% produces in two sectional first districts of reaction channel, and 5-25%, the reaction heat of preferred 5-15% produces in second subregion.At this, subregion, especially first subregion can be made up of a plurality of reactor units.Reaction is preferably carried out in three reactor units and the controlled reaction heat that makes each 35-50% produces in Unit first and second and the reaction heat of 5-15% produces in Unit the 3rd.For example, 50%, 40% and 10% or 46%, 46% and 8% reaction heat can be respectively discharges in first, second and the 3rd reactor unit.
Also but the cascade of operant response device makes the final reactor unit in this chain only cool off by the input of reactant.
The inventive method is particularly advantageous economically be the selective reaction condition so that the reactor ejecta except the catalyzer that consumes and do not consume, comprise 5-40% weight, the methyl alcohol and the 60-95% weight of preferred 10-25% weight, the methyl-formiate of preferred 75-90% weight.
In addition, particularly advantageous is that reactant adding and reaction conditions are mated, so that 90-99%, the institute of preferred 95-99% adds carbon monoxide and changes into methyl-formiate.
Carbon monoxide, methyl alcohol and catalyzer mix in reaction zone, make rapid reaction become possibility in this good gas dispersion.For example, advantageously in reactor, add gas or utilize suitable agitator such as high speed agitator that it is dispersed in the reactor by nozzle.Also can advantageously utilize the outer loop of each reactor unit to mix.Carbon monoxide stream can add or add a reactor unit at a position, or adds or add the different reactor unit as a plurality of son streams at the different sites of reactor.
In the methods of the invention, methyl-formiate is synthetic is the processing of the reaction mixture that obtains not being had solid matter in reactor cascade afterwards.In principle, this processing can be carried out under the synthetic pressure being used for.But obviously more advantageously in the upstream of stripper plant reaction mixture is decompressed to the 5-25 crust, the pressure of preferred 10-20 crust is especially considered to distill and is handled required temperature.In order to keep the least possible recycle stream and to avoid condensation in compressor, more a spot of gained is discharged gas cooling, preferred methyl alcohol and the methyl-formiate of carrying secretly with condensation to room temperature or envrionment temperature advantageously all is recycled to the somewhere, upstream of CO compressor then and is fed in the synthetic system once more.
Total liquid phase of the reaction product that after decompression, stays, for example form, it is handled in water distilling apparatus subsequently to evaporate the methyl-formiate of major portion by the mixture and trace dme, carbon monoxide and other inert substance that comprise about 75% weight methyl-formiate, just be lower than the methyl alcohol of 25% weight and remainder catalyst (decompose and undecomposed).Certainly, a certain proportion of methyl alcohol that is present in the reaction product evaporates simultaneously.In order to evaporate methyl-formiate, the pressure on the reaction product is suitable further to be reduced, and clings to the pressure of preferred 1.5-2.0 crust so that set up 1.5-2.5 at the water distilling apparatus top.Usually to the required vaporization heat of the evaporation of small part Already in the thermal response product.All the other are supplied with by this water distilling apparatus of direct heating or by supplying with heat exchange medium.
According to the required purity of the methyl-formiate that makes, the reflux ratio of setting in the water distilling apparatus makes the methyl-formiate of 85-90% weight purity to take out at the top.
Isolating that part of reactor ejecta that stays after the methyl-formiate is made up of the methyl alcohol that comprises active and spent catalyst basically.This solution is divided into direct recirculation and gets back to the TR part of reactor cascade and the TA part of being discharged by this circulation loop.As mentioned above, control TR: TA splitting ratio, this depend on the degassing in the reaction product alkali metal formate or the content of alkaline-earth metal formate, purpose is to determine that this splitting ratio is so that the solid of an alkali metal salt or alkaline earth salt is separated out any position that can not appear at this technology.This can by set TR and TA make by desalting plant leave this technology decaying catalyst amount corresponding to one way during through this reactor and the amount that in further processing step, consumes realize.Certainly, some still active catalyzer enters desalting plant, so that this ratio catalyzer leaves this technology.
Advantageously control splitting ratio so that the alkali metal formate of reactor exit or alkaline-earth metal formate content are 0.05-0.5% weight, preferred 0.1-0.3% weight.
Rule of thumb, the 20-80% of the methyl alcohol that contains catalyzer that will stay after separating methyl-formiate discharges to keep the constant synthetic operation.
The discharge section TA that comprises the methyl alcohol of catalyzer and catalyst decomposes product carries out desalination in a kind of mode of not having solid matter subsequently.For this reason, enough water vapors and/or hot water and possible extra heat are added liquid phase in this desalting plant, so that methyl alcohol evaporates and obtain the aqueous solution of catalyst decomposes product basically fully.Term herein " catalyst decomposes product " comprises alkali metal hydroxide or the alkaline earth metal hydroxides that is formed by residual activity catalyzer and water.
In this operation, the amount of setting water vapor and/or hot water makes catalyzer and degradation production thereof remain in the aqueous solution reliably.In general, if the concentration of catalyst decomposes product in the moisture ejecta of this desalting plant is 5-20% weight, preferred 6-12% weight, 8% weight for example, this condition is met so.
Preferably 2-6 is clung to, preferred 3-5 bar pressure, for example the water vapor of open steam form is fed in this desalting plant.
Valuable especially economically is that desalting plant and water distilling apparatus are operated in the hot system of an integration, and the methanol steam that wherein will leave the desalting plant top is fed in the water distilling apparatus.
At this moment, particularly advantageous is to select the pressure at desalting plant top to make the vapour stream at this device top directly to be fed in the water distilling apparatus.
Being used for the technology that desalination comprises the methyl alcohol of residual activity catalyzer and spent catalyst at this in a kind of mode of not having solid matter is a theme of the present invention equally.The special value of this part technology is, might carry out whole methyl-formiate in the mode of no solid matter like this and synthesize.
Except catalyzer, the methyl alcohol that consumes in synthetic must be fed in the reactor cascade.The methyl alcohol that is used for technology of the present invention is the pure methyl alcohol of chemical grade or technical grade.It also can be by other technology, and for example methyl formate hydrolysis reclaims to the technology of formic acid and methyl alcohol.In order to guarantee alap catalyst consumption, preferably use water-content to be lower than 100ppm, preferably be lower than 30ppm, especially the methyl alcohol of 5-15ppm.
By the same token and in order to obtain high as far as possible reaction-ure conversion-age, advantageously use to comprise carbon monoxide and CO content is the 45-100% volume, the carbon monoxide of the gaseous mixture form of preferred 70-100% volume, especially 90-100% volume.If use this gaseous mixture, total pressure preferably sets and makes that carbon monoxide pressure of tension is the 90-180 crust.
The gas phase that contains CO can be included in other gas of inert under the synthesis condition, as hydrogen, nitrogen, hydrocarbon.
Under certain conditions, for example, if technology of the present invention is operated as the part with other technology or integration system, or under the situation that is suitable for particularly advantageous buying condition, also can advantageously use the waste gas that comprises about 50% volume CO to operate technology of the present invention economically.Because this technology can adapt to the variation of processing condition well, if use this waste gas, also can obtain the methyl-formiate of any required purity of good yield.Technology of the present invention obtains to surpass 90% mole usually, even surpasses 95% mole methyl-formiate productive rate, is base with used CO.Based on used methyl alcohol, if use high percentage ratio CO or pure CO, productive rate is essentially 100% mole.
Another advantage of technology of the present invention is that the waste water of being discharged by desalting plant only comprises 15-30ppm, and generally the methyl alcohol of about 20ppm does not promptly have methyl alcohol basically.
The water cooler that is used for this technology uses river and/or cold water operation.
Technology of the present invention can be under low catalyst concentration and middle pressure, obtains 400 under the final methyl-formiate concentration of 80% weight to above 1000 kilograms/meter surpassing
3/ hour high space-time yield.Required low catalyst concentration helps to obtain the remarkable reduction of starting raw material cost, and medium synthesis pressure has avoided being used for the high fund cost of high-tension apparatus.In addition, technology of the present invention can operating device makes without any the salt throw out, eliminated blockage problem like this and obviously increased the utilizability and the year productivity therefore of this equipment.Methanol conversion is therefore also obviously less apparently higher than the amount of the common low pressure process and the round-robin methyl alcohol of wanting.Processing of the present invention needs considerably less energy, makes it can be directly used in further reaction but the concentration of gained methyl-formiate is so high, for example is hydrolyzed into formic acid.
The favourable characteristics of another of technology of the present invention are, the variation that it very can the adaptive response condition, and this is desirable, can set the quality of desirable especially final product like this.In addition, this technology also can use different catalysts, different amount catalyzer to measure with different CO according to utilizability in same device when implementing immaculately.A special technological merit is, the parameter of technology of the present invention can change in grace period and can not cause the precipitation of catalyzer and catalyst decomposes product such as alkali metal formate or alkaline-earth metal formate.Therefore, can be on the internal surface of equipment, especially form any solid deposits on heat-exchanger surface, avoided relating to controlled temperature and the problem that relates to line clogging in the individual equipment zone so fully, this is common in known high-pressure process.
Transformation efficiency in the reaction can by can be stressed and the heat power equilibrated position of temperature regulation influence and by stoichiometry and/or reactant the residence time in reactor control.High final transformation efficiency has reduced the amount that does not consume starting raw material that obtains being recycled to reaction system in processing.The CO transformation efficiency that has been found that the 90-99% theoretical value is favourable.
Another advantage of technology of the present invention is, because the high CO transformation efficiency of many relatively already known processes, need not the unreacted CO of recirculation at all, this has eliminated the fund cost that is used for compressor, or a spot of unreacted carbon monoxide of recirculation if desired, this can realize by the compression work of minimum quantity.
According to present nomenclature, the technology of the present invention apparently higher than present low pressure process of operating pressure 90-160 crust is to be depressed into high-pressure process in a kind of.Under surpassing 100 crust, in the already known processes of operation, there is not catalyst recycle.The catalyzer of all uses is dropped after the primary first-order equation process.Another complexcase that occur in the known high and medium voltage technology are to form methyl-formiate/methyl alcohol/salt suspensioning liquid, only can could therefrom isolate salt by the solids treatment of complexity.
Need therein under the situation of the known low-pressure of catalyst recycle and middle compression technology, strictness is avoided adding entry in circulation, because catalyzer can be by water destruct.In these technologies, because spent catalyst must be removed from system, therefore in these cases, it also must for example be discharged by filtration or centrifugal treating by the solids treatment technology equally.
Now shockingly find, in technology of the present invention, but the not spent catalyst recirculation of part and can in device unit, especially on heat exchanger, not crusting.In addition, technology of the present invention has avoided the solid matter of technical complexity to handle fully, carry out this separation by the thermal distillation approach purely because shockingly found mode that a kind ofly not have solid matter, and design this method like this, so that spent catalyst is discharged from as the aqueous solution, although added water, the not spent catalyst of signal portion can be recycled to this synthetic system.
The present invention also provides a kind of and has produced the equipment of methyl-formiate by the above-mentioned technology of the present invention, comprising:
A) synthetic group composed as follows basically:
A1) have at least two separate heatable and coolable reactor units, have the recirculation methyl alcohol that is used for new methyl alcohol, contains catalyzer, be used for new catalyzer methanol solution and be used to comprise the reinforced pipeline of the gaseous mixture of carbon monoxide; At least each export pipeline that is used for reaction product and residual gas; Be used for producing and keep the equipment of air-flow at the finely divided state of liquid flow; With the instrument that is used for monitoring temperature and pressure,
A2) be used for reaction product is decompressed to having cooling unit and having the reinforced pipeline that is used for reaction product and be used for residual gas and the reliever of the export pipeline of liquid phase of processing pressure,
B) treatment group composed as follows basically:
B1) be used for separating basically the water distilling apparatus of methyl-formiate, have the reinforced pipeline that is used for liquid phase and be used for methyl-formiate basically and be used to contain the export pipeline of the residual methanol of catalyzer from the liquid phase of reaction product,
B2) be used for and will leave the methyl alcohol diverting flow Cheng Ziliu TR that comprises remainder catalyst and catalyst decomposes product of water distilling apparatus and the adjustable logistics splitter of TA,
B3) can have heating and cooling unit and operate in a kind of mode of not having solid matter, have the methyl alcohol that is used to comprise remainder catalyst and catalyst decomposes product and be used for the inlet of hot water or water vapor and be used for methanol vapor and be used for the desalting plant of the outlet of salt brine solution
C) be used for suitable transmission reaction partner and product between environment division A and B connecting pipeline and, if desired, pump and be used for the reinforced pipeline of starting raw material and be used for the export pipeline of methyl-formiate and waste gas.
As an example, accompanying drawing has schematically provided the present invention and is used to prepare the equipment of methyl-formiate and is integrated in wherein desalting plant of the present invention.According to a preferred embodiment, this desalting plant is operated in the hot system that directly integrates with water distilling apparatus.
The part A of accompanying drawing has provided synthetic group, comprise reactor (1), it have three reactor units and be used for new methyl alcohol (2), comprise catalyzer recirculation methyl alcohol (3), be used for raw catalyst methanol solution (4) and be used to comprise the reinforced pipeline of the gaseous mixture (5) of carbon monoxide, be respectively applied for the export pipeline of reaction product (6) and residual gas (7), be used for producing and keep the equipment (8) of air-flow at the finely divided state of liquid flow; With the reliever of being furnished with cooling unit (9) (10), it is used for reaction product is decompressed to processing pressure, has the reinforced pipeline (11) that is used for reaction product and is used for residual gas (12) and the export pipeline of liquid phase (13).
The part B of accompanying drawing has provided treatment group, comprise being used for to have the reinforced pipeline (15) that is used for liquid phase and be used for methyl-formiate (16) basically and be used to contain the export pipeline of the residual methanol (17) of catalyzer from the liquid phase separation of the reaction product water distilling apparatus of methyl-formiate (14) basically; Be used for to leave the methyl alcohol diverting flow Cheng Ziliu TR that comprises remainder catalyst and catalyst decomposes product of water distilling apparatus and the adjustable logistics splitter (18) of TA; Be used for the desalting plant (19) operated in the solid matter mode, it has the inlet of the methyl alcohol (20) that is used to comprise remainder catalyst and catalyst decomposes product and hot water or water vapor (21) and is used for methanol vapor (22) and the outlet of salt brine solution (23); Be used for refrigerating unit (24) from the methyl-formiate of water distilling apparatus (14) pipeline (16); Be used for refrigerative methyl-formiate (25) and be used for the outlet of residual gas (26).This accompanying drawing gives the pump (27a and 27b) as utility appliance.
Reactor unit can be configured to container or pipe reactor.Need not each reactor unit and be configured to one equipment.On the contrary, can use any structure of reactor that can realize the unitary function of a plurality of tandem reactors.Therefore undoubtedly can use and be divided at least two, the single reactor of preferred 2-5, an especially 2-4 reaction zone by suitable internals.If below mention reactor unit, this term also comprises the reaction zone of being divided in the single reactor.Otherwise term " reaction zone " also comprises single reactor unit.This reactor can be configured to container or pipe reactor equally.
Each reactor unit should have adjustable reinforced and the heating maybe of export pipeline and (if desired) self that is used for reactant and product of self can cool off the outer loop.In addition, the temperature and pressure of reactor unit can singlely be controlled.Cascade can have temperature distribution or operate under consistent temperature.The reactor that has the cooling of internal cooling system or chuck or have an external loop of heat exchanger can be used for technology of the present invention.
The favourable constitutional features of these of present device should obtain when using sectional single reactor.
Therefore advantageously construct reactor, make that it can heating and/or cooling in each district.
In addition, this single reactor should have a plurality of export pipeline and (if desired) that are distributed on its length direction and belong to the reinforced pipeline that is used for reactant of single reaction zone and be used for discharging and belongs to heating of reaction zone and/or coolable outer loop.
Being installed in the equipment that is used for finely divided reactant in reactor or the reactor unit is, for example sieve plate, frit (Fritten) or nozzle.Reactor unit or sectional reactor also can advantageously have baffling inner member and/or whipping device.
The water distilling apparatus B1 of production unit of the present invention can distill out methyl-formiate from feed streams, that is, separate by selecting evaporation.In order to prepare the methyl-formiate that is applicable to that formic acid is produced, simple stripping tower generally can be used to distill operation satisfactorily.But also can provide tower, can take out more highly purified methyl-formiate stream at cat head like this with rectifying section.This tower is just operated as rectifying tower under refluxing like this.
This tower is made up of the tubular type ducted body with separation tray basically, can be as required can heating or cooling in each district, and have being used on the correct position outgas reaction product inlet, be used to take out overhead product and the outlet of the methyl alcohol that comprises catalyzer and catalyst decomposes product at the bottom of the tower and other reinforced pipeline that (if desired) is used for liquid or gaseous heat exchange medium of cat head.
Advantageously use a kind of its separation efficiency to be enough to from degassing reaction product, take out the tower of the methyl-formiate of required purity at this at cat head.
In general, design this tower with the methyl-formiate that obtains 85-90% weight purity (all the other=methyl alcohol).The methyl-formiate that is obtained should distill from reaction mixture in a simple stripping tower that does not have a separation tray, so that concentration can increase to 85-90% weight by 70-80% weight (concentration in the reaction mixture).This needs obviously to obtain the lower energy of 95-97% purity methyl-formiate than rectifying.Make and purity for example has many industrial uses for the methyl-formiate of 85-90% weight according to the present invention.Especially, it can be directly used in hydrolysis and prepares formic acid.
Desalting plant B3 is made up of rectifying tower basically, it can be as required can heating or cooling in each district, can have separation tray and be furnished with the reinforced pipeline that is used to comprise the methyl alcohol of remainder catalyst and catalyst decomposes product and be used for hot water and/or water vapor on the correct position, be used for taking out overhead product and at the bottom of tower, taking out the export pipeline of the water that comprises the catalyst decomposes product at cat head.This rectifying tower has to be enough to take out to comprise at cat head be lower than 100ppm, preferably is lower than 30ppm, the separation efficiency of the methyl alcohol of the water of especially about 5-15ppm.In general, simple stripping tower can be used for this purpose satisfactorily.
Supply with the water vapor of desalting plant or hot water or preferably thereunder, especially in bottom zone, add in the inlet region of the methyl alcohol that is used for comprising remainder catalyst and catalyst decomposes product.
The methyl alcohol that takes out at the desalting plant top condensable and or be recycled to synthetic group or under certain pressure evaporation to be fed to water distilling apparatus as gaseous heat exchange medium.Therefore this need another vaporizer in the bottom of water distilling apparatus.
But particularly advantageous and economical is, as a hot system operation water distilling apparatus and a desalting plant of directly integrating, wherein set the force value of high like this desalting plant cat head, make and the methanol vapor of therefrom discharging directly can be added water distilling apparatus as gaseous heat exchange medium.Also can water distilling apparatus and desalting plant be merged into one in principle and have the side outlet that is used for liquid phase and the tower of inlet by a suitable integrated structure.
Another economic especially embodiment of the present invention is to use the used heat of autoreactor to come operation processing equipment, and especially desalting plant if desired, is installed heat pump.
The present invention also provides above-mentioned being used for of being made up of rectifying tower basically to operate desalting plant in no solid matter mode, it can heat or cooling in each district as required, can have separation tray and on correct position, be furnished with the reinforced pipeline that is used to comprise the methyl alcohol of remainder catalyst and catalyst decomposes product and is used for hot water and/or water vapor, be used for taking out overhead product and at the bottom of tower, taking out the export pipeline of the water that comprises the catalyst decomposes product at cat head, and its separation efficiency is enough to make take out to comprise at cat head and is lower than 100ppm, preferably be lower than 30ppm, the methyl alcohol of the water of especially about 5-15ppm.
In a preferred embodiment, supply with the water vapor of desalting plant or hot water or preferably thereunder, especially in bottom zone, add in the inlet region of the methyl alcohol that is used for comprising remainder catalyst and catalyst decomposes product.
The present invention also provides the aforesaid combination of water distilling apparatus and desalting plant, and the methanol vapor that wherein will leave the desalting plant top adds in the water distilling apparatus as heat exchange medium.Following examples have illustrated technology of the present invention and have been used to implement its apparatus of the present invention.
Embodiment 1
Three volumes are respectively 2 liters and be furnished with the outer loop with heat exchanger, the reinforced pipeline that is used for liquid phase respectively and be used for the export pipeline of gas phase and the vertical pipe reactor that is used for the export pipeline of liquid phase and is used for the nozzle entrance of gas phase in bottom zone is connected in series mutually in top region, make reactor bottom adds below gas phase to make progress and flow through all three reactors in succession, and can flow through all three reactors downwards in succession in the reinforced liquid phase of the top region of the top reactor.
Should synthetic arrange and be used to carry out 12 experiments, wherein methyl alcohol and be alkali methylates methanol solution form catalyzer the top feeding of reactor cascade and CO by nozzle by below feed in raw material.Feeding quantity provides in table 1.Pressure and temperature in the reactor also is set to the value shown in the table 1.
The product that takes out in reactor cascade bottom is decompressed to pressure 15 crust and the release gas of gained is cooled to methyl alcohol and the methyl-formiate that room temperature is carried secretly with the condensation gasiform in one two step water cooler in reliever.Remaining gas phase is recycled to reactor cascade, analyzes methyl-formiate in this merging liquid phase by gas-chromatography and wet-chemical analysis then.
Last 4 hurdles of table 1 have provided the gained experimental result.
The abbreviation that is used for this table has following implication:
RZA is a throughput, based on all reactor used cubic capacitys,
NaOMe is a sodium methylate, and KOMe is that potassium methylate and MeFo are methyl-formiates.
The transformation efficiency that is write down is based on used methyl alcohol.
For further processing reaction product, it is fed to simple stripping tower, wherein the methyl-formiate major part is gone out by stripping by the methanol vapor that is fed to this tower under the pressure of about 1.8 crust.
The methyl alcohol that takes out in the bottom of this tower and consume and the mixture of spent catalyst is not through a splitter, 1/3 mixture is recycled to reactor cascade and 2/3 and is fed to the desalination tower thus.In the desalination tower, under the internal pressure of about 2 crust, cling to the methanol solutions that contain catalyzer and salt that steam-treated added with 4.The add-on of setting water vapor makes and can take out anhydrous basically methanol steam at cat head.This methanol vapor advantageously directly adds distillation tower as heat exchange medium.The alkali metal hydroxide and the alkali metal formate aqueous solution take out in the bottom of desalination tower.
Embodiment 2
With two length is that 200 centimetres and internal diameter are 4.5 centimetres (volume=3.15 liter) and have the embedded heat exchanger pipe, be used for the inlet of liquid and gas and be connected in series mutually at the pipe reactor that top region is used for the outlet of liquid and gas in bottom zone, the inlet that wherein is used for gas phase is configured to nozzle, makes reactor bottom adds below liquid and gas to make progress and to flow and flows through all three reactors in succession.
Should synthetic arrange and be used to carry out 19 experiments, wherein methyl alcohol, for the catalyzer of alkali methylates methanol solution form and (passing through nozzle) CO by bottom feed to reactor cascade.Feeding quantity provides in table 2.Pressure and temperature in the reactor also is set to the value shown in the table 2.
Last 4 hurdles of table 2 have provided the gained experimental result.
Described according to embodiment 1, further processing reaction product.
Table 1, the adverse current experiment
| The embodiment sequence number | CO [l/h] | MeOH [kg/h] | Catalyzer | Pressure (crust) | Temperature [℃], measure at the middle part of reactor R | MeFo in the ejecta [% weight] | The salt precipitation [be/not] | Transformation efficiency 2 [%] | RZA [kg/m 3/h] | |||
| Kind | [％ | R1 | R2 | R3 | ||||||||
| 1 | 1110 | 2，5 | NaOMe | 0，20 | 109 | 90 | 90 | 90 | 75 | Not | 61，5 | 520 |
| 2 | 1790 | 2，9 | NaOMe | 0，20 | 136 | 90 | 90 | 88 | 80 | Not | 68，1 | 750 |
| 3 | 1120 | 2，3 | NaOMe | 0，30 | 95 | 90 | 90 | 85 | 74 | Not | 60，3 | 580 |
| 4 | 1540 | 3，3 | NaOMe | 0，30 | 111 | 90 | 90 | 84 | 74 | Not | 60，3 | 830 |
| 5 | 970 | 2，6 | NaOMe | 0，20 | 97 | 100 | 100 | 90 | 67 | Not | 52，0 | 550 |
| 6 | 1640 | 3，5 | NaOMe | 0，20 | 117 | 100 | 100 | 90 | 73 | Not | 59，1 | 880 |
| 7 | 1600 | 3，5 | NaOMe | 0，30 | 97 | 100 | 100 | 95 | 68 | Not | 53，1 | 790 |
| 8 | 720 | 1，5 | KOMe | 0，20 | 112 | 90 | 90 | 76 | 73 | Not | 59，1 | 370 |
| 9 | 950 | 2，0 | KOMe | 0，20 | 126 | 90 | 90 | 72 | 75 | Not | 61，5 | 520 |
| 10 | 950 | 2，0 | KOMe | 0，26 | 105 | 90 | 90 | 82 | 73 | Not | 59，1 | 480 |
| 11 | 970 | 2，5 | KOMe | 0，26 | 95 | 100 | 100 | 91 | 63 | Not | 47，6 | 520 |
| 12 | 1590 | 3，5 | KOMe | 0，26 | 116 | 100 | 100 | 79 | 69 | Not | 54，3 | 790 |
1) based on the reinforced weight of liquid
2) based on used methyl alcohol
Table 2, and stream experiment
| The embodiment sequence number | CO[l/h] | MeOH kg/h] | Catalyzer | Pressure (crust) | Temperature [℃], measure at the middle part of reactor R | MeFo in the ejecta [% weight] | The salt precipitation [be/not] | Transformation efficiency 2 [％] | RZA [kg/m 3/h] | ||
| Kind | [% weight] 1 | R1 | R2 | ||||||||
| 1 | 1864 | 2，99 | NaOMe | 0，18 | 130 | 100 | 100 | 76，9 | Not | 64，0 | 560 |
| 2 | 1836 | 2，97 | NaOMe | 0，20 | 110 | 100 | 110 | 69，4 | Not | 54，8 | 470 |
| 3 | 1952 | 2，91 | NaOMe | 0，21 | 120 | 100 | 110 | 73，5 | Not | 59，7 | 510 |
| 4 | 2101 | 2，97 | NaOMe | 0，20 | 140 | 100 | 110 | 79，0 | Not | 66，7 | 580 |
| 5 | 2186 | 3，01 | NaOMe | 0，20 | 150 | 100 | 110 | 81，0 | Not | 69，5 | 610 |
| 6 | 1798 | 2，99 | NaOMe | 0，20 | 140 | 90 | 100 | 80，2 | Not | 68，4 | 600 |
| 7 | 1721 | 2，59 | NaOMe | 0，25 | 140 | 90 | 100 | 86，8 | Not | 77，8 | 590 |
| 8 | 1428 | 2，99 | NaOMe | 0，12 | 140 | 100 | 110 | 70，6 | Not | 56，2 | 480 |
| 9 | 2031 | 4，00 | NaOMe | 0，21 | 140 | 100 | 110 | 80，2 | Not | 68，4 | 790 |
| 10 | 2330 | 4，99 | NaOMe | 0，21 | 140 | 100 | 110 | 72，3 | Not | 58，2 | 840 |
| 11 | 1851 | 3，11 | NaOMe | 0，30 | 140 | 100 | 110 | 80，5 | Not | 68，8 | 620 |
| 12 | 2430 | 5，89 | NaOMe | 0，21 | 140 | 100 | 110 | 66，1 | Not | 51，0 | 870 |
| 13 | 2064 | 4，19 | NaOMe | 0，19 | 140 | 100 | 110 | 73，8 | Not | 60，0 | 720 |
| 14 | 2484 | 4，90 | NaOMe | 0，32 | 140 | 100 | 110 | 74，7 | Not | 61，2 | 860 |
| 15 | 2722 | 6，01 | NaOMe | 0，31 | 150 | 100 | 110 | 71，3 | Not | 57，0 | 990 |
| 16 | 1706 | 3，56 | NaOMe | 0，12 | 160 | 100 | 110 | 71，1 | Not | 56，8 | 590 |
| 17 | 1857 | 3，55 | NaOMe | O，15 | 160 | 100 | 110 | 75，8 | Not | 62，6 | 650 |
| 18 | 2002 | 4，09 | NaOMe | O，19 | 140 | 100 | 95 | 73，7 | Not | 59，9 | 710 |
| 19 | 2564 | 3，77 | NaOMe | 0，21 | 140 | 95 | 110 | 78，2 | Not | 65，7 | 730 |
Claims (10)
1. method for preparing methyl-formiate, comprise excessive methanol and carbon monoxide under super-atmospheric pressure and high temperature, in the presence of as the alkali methylates of catalyzer or alkaline-earth metal methylate, in voltage-resistant reactor, react, from reaction product, separate formed methyl-formiate and will not have the liquid phase of methyl-formiate to be recycled to reactor basically, the liquid phase of the recirculation of wanting of while discharge section also adds raw catalyst solution, wherein said being reflected in the cascade that comprises at least two reactor units under 80-120 ℃, under the carbon monoxide pressure of 90-180 crust, in the presence of based on the alkali metal alcoholates of liquid charge weight 0.05-0.5% weight or alkaline-earth alkoxides, carry out, set the ratio of the amount of reinforced starting raw material of unit time, temperature of reaction, pressure and reactant in reactor unit the residence time so that keep catalyst system therefor and degradation production under reaction conditions in reactor and the methyl alcohol that in new reactor ejecta, dissolves aequum basically fully unreacted still, total ejecta of reactor through a water distilling apparatus from reaction mixture, to strip methyl-formiate basically, a part of TR of residue liquid phase is recycled to reactor and will discharges for a part of TA of the 20-80% of described liquid phase, in a desalting plant, from the part of discharging, remove remainder catalyst and catalyst decomposes product then, and will remain methyl alcohol and directly or indirectly be back to reactor in the mode of no solid matter.
2. according to the desired method of claim 1, it uses 2-5 reactor unit to carry out.
3. according to the desired method of claim 1, wherein water vapor and/or hot water and extra heat as required supplied with the discharge section TA of the liquid phase that stays after separating methyl-formiate, be made up of the methyl alcohol that comprises catalyzer and catalyst decomposes product basically in desalting plant, its amount makes methyl alcohol evaporate and obtain the aqueous solution of catalyst decomposes product basically fully.
4. according to the desired method of claim 1, wherein the desalting plant methanol vapor of operating and will leave the desalting plant top with water distilling apparatus in integrating hot system is fed to water distilling apparatus.
5. one kind by producing the equipment of methyl-formiate according to the method for claim 1, comprising:
A) synthetic group composed as follows basically:
A1) have at least two separate heatable and coolable reactor units, have the recirculation methyl alcohol that is used for new methyl alcohol, contains catalyzer, be used for new catalyzer methanol solution and be used to comprise the reinforced pipeline of the gaseous mixture of carbon monoxide; At least each export pipeline that is used for reaction product and residual gas; Be used for producing and keep the equipment of air-flow at the finely divided state of liquid flow; With the instrument that is used for monitoring temperature and pressure,
A2) be used for reaction product is decompressed to having cooling unit and having the reinforced pipeline that is used for reaction product and be used for residual gas and the reliever of the export pipeline of liquid phase of processing pressure,
B) treatment group composed as follows basically:
B1) be used for separating basically the water distilling apparatus of methyl-formiate, have the reinforced pipeline that is used for liquid phase and be used for methyl-formiate basically and be used to contain the export pipeline of the residual methanol of catalyzer from the liquid phase of reaction product,
B2) be used for and will leave the methyl alcohol diverting flow Cheng Ziliu TR that comprises remainder catalyst and catalyst decomposes product of water distilling apparatus and the adjustable logistics splitter of TA,
B3) can have heating and cooling unit and operate in a kind of mode of not having solid matter, have the methyl alcohol that is used to comprise remainder catalyst and catalyst decomposes product and be used for the inlet of hot water or water vapor and be used for methanol vapor and be used for the desalting plant of the outlet of salt brine solution
C) be used for suitable transmission reaction partner and product between environment division A and B connecting pipeline and, if desired, pump and be used for the reinforced pipeline of starting raw material and be used for the export pipeline of methyl-formiate and waste gas.
6. according to the desired device of claim 5, wherein used water distilling apparatus B1 is the tower that its separation efficiency is enough to take out from degassing reaction product through the top methyl-formiate of required purity.
7. according to the desired device of claim 5, wherein said desalting plant B3 is made up of rectifying tower basically, it can heat or cooling in each district as required, can have separation tray and be furnished with the methyl alcohol and the reinforced pipeline that is used for hot water and/or water vapor that are used to comprise remainder catalyst and catalyst decomposes product on the correct position, be used for taking out overhead product and at the bottom of tower, taking out the export pipeline of the water that comprises the catalyst decomposes product, and its separation efficiency is enough to take out the methyl alcohol that comprises the water that is lower than 100ppm at cat head at cat head.
8. according to the desired device of claim 7, wherein said separation efficiency is enough to take out the methyl alcohol that comprises the water that is lower than 30ppm at cat head.
9. according to the desired device of claim 7, wherein said separation efficiency is enough to take out at cat head the methyl alcohol of the water that comprises 5-15ppm.
10. according to the desired device of claim 5, the methanol vapor of wherein leaving the desalting plant top is sent in the water distilling apparatus as heat exchange medium by connecting pipeline or suitable syndeton.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19935038A DE19935038A1 (en) | 1999-07-26 | 1999-07-26 | Process for the continuous production of methyl formate |
| DE19935038.8 | 1999-07-26 |
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| CN1364152A CN1364152A (en) | 2002-08-14 |
| CN1231454C true CN1231454C (en) | 2005-12-14 |
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| US (1) | US6921833B1 (en) |
| EP (1) | EP1206439B1 (en) |
| JP (1) | JP5021128B2 (en) |
| KR (1) | KR100701113B1 (en) |
| CN (1) | CN1231454C (en) |
| AT (1) | ATE358113T1 (en) |
| AU (1) | AU6829500A (en) |
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| DE3621362A1 (en) | 1986-06-26 | 1988-01-28 | Basf Ag | METHOD FOR PRODUCING ALKYL FORMATS |
| DE3710726A1 (en) | 1987-03-31 | 1988-10-13 | Schleicher Relais | Apparatus for inserting elastomeric cords as seals in housing parts |
| DE3832340A1 (en) * | 1988-09-23 | 1990-03-29 | Krupp Koppers Gmbh | METHOD AND DEVICE FOR OPTIMIZING THE OPERATION OF AN OUTPUT COLUMN PROVIDED WITH A SIDE COOKER |
| DE3904711A1 (en) * | 1989-02-16 | 1990-08-23 | Krupp Koppers Gmbh | ESPECIALLY DRIVE COLUMN SUITABLE FOR SEPARATION OF APPLICATION PRODUCTS WITH HIGH BOILING DIFFERENCE |
| BR9100174A (en) | 1991-01-16 | 1992-09-08 | Jose Paulo Vieira Salles | PROCESS OF OBTAINING COLORED ANODIZED ALUMINUM BY METAL ELECTRODEPOSITION |
| DE4237379A1 (en) | 1992-11-05 | 1994-05-11 | Salzgitter Anlagenbau | A process for the production of methyl formate |
| DE4309731A1 (en) | 1993-03-25 | 1994-09-29 | Basf Ag | Process for the preparation of methyl formate |
| DE19506555A1 (en) * | 1995-02-24 | 1996-08-29 | Basf Ag | Process for the continuous production of methyl formate |
| BR9501255A (en) | 1995-03-29 | 1997-05-27 | Salles Jose Paulo Vieira | Process of using electrolytes and metal salts specific for electrostaining of anodized aluminum in a single step |
| BR9501280A (en) | 1995-03-30 | 1997-05-27 | Salles Jose Paulo Vieira | Improvement introduced in the process of using electrolytes and specific metal salts for electrocoloring anodized aluminum in two baths |
-
1999
- 1999-07-26 DE DE19935038A patent/DE19935038A1/en not_active Withdrawn
-
2000
- 2000-07-26 CN CNB008108420A patent/CN1231454C/en not_active Expired - Fee Related
- 2000-07-26 AT AT00956304T patent/ATE358113T1/en not_active IP Right Cessation
- 2000-07-26 JP JP2001512480A patent/JP5021128B2/en not_active Expired - Fee Related
- 2000-07-26 EP EP00956304A patent/EP1206439B1/en not_active Expired - Lifetime
- 2000-07-26 DE DE50014201T patent/DE50014201D1/en not_active Expired - Lifetime
- 2000-07-26 MY MYPI20003408A patent/MY137129A/en unknown
- 2000-07-26 AU AU68295/00A patent/AU6829500A/en not_active Abandoned
- 2000-07-26 KR KR1020027001062A patent/KR100701113B1/en not_active IP Right Cessation
- 2000-07-26 WO PCT/EP2000/007199 patent/WO2001007392A1/en active IP Right Grant
- 2000-07-26 US US10/031,166 patent/US6921833B1/en not_active Expired - Lifetime
-
2002
- 2002-01-23 NO NO20020349A patent/NO327885B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NO327885B1 (en) | 2009-10-12 |
| KR100701113B1 (en) | 2007-03-29 |
| AU6829500A (en) | 2001-02-13 |
| WO2001007392A1 (en) | 2001-02-01 |
| NO20020349D0 (en) | 2002-01-23 |
| JP5021128B2 (en) | 2012-09-05 |
| US6921833B1 (en) | 2005-07-26 |
| EP1206439A1 (en) | 2002-05-22 |
| ATE358113T1 (en) | 2007-04-15 |
| KR20020015719A (en) | 2002-02-28 |
| MY137129A (en) | 2008-12-31 |
| EP1206439B1 (en) | 2007-03-28 |
| NO20020349L (en) | 2002-01-23 |
| DE50014201D1 (en) | 2007-05-10 |
| CN1364152A (en) | 2002-08-14 |
| DE19935038A1 (en) | 2001-02-01 |
| WO2001007392A9 (en) | 2003-04-03 |
| JP2004510686A (en) | 2004-04-08 |
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